291941993 has 8 divisors (see below), whose sum is σ = 333813312. Its totient is φ = 250112016.

The previous prime is 291941987. The next prime is 291941999. The reversal of 291941993 is 399149192.

It is an interprime number because it is at equal distance from previous prime (291941987) and next prime (291941999).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 291941993 - 2¹⁰ = 291940969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (291941999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6671 + ... + 25067.

It is an arithmetic number, because the mean of its divisors is an integer number (41726664).

Almost surely, 2^291941993 is an apocalyptic number.

It is an amenable number.

291941993 is a deficient number, since it is larger than the sum of its proper divisors (41871319).

291941993 is a wasteful number, since it uses less digits than its factorization.

291941993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20671.

The product of its digits is 157464, while the sum is 47.

The square root of 291941993 is about 17086.3101048764. The cubic root of 291941993 is about 663.3848098286.

The spelling of 291941993 in words is "two hundred ninety-one million, nine hundred forty-one thousand, nine hundred ninety-three".